Glitch : The leveling 2 quest cannot be done if you are higher than lv 10 when you start it (easy to do if you left the browser going for a little while... xD)
Suggestions : (no order of importance)
1. Make the projectiles go faster / you fall slower
2. Give the enemies and their shots either a different color or at least a white / red outline or hue (I understand that black fits with the theme, but c'mon, invisible enemies and projectiles?)
3. Allow the tasks to be completed on individual bases ie. complete a survival, get the next survival available, and keep the upgrades the same, every 3 upgrades from any tier gets the bonus
4. Perhaps a better Windfall system, ie. every 30 sec it goes up by .5 multiplier, or every 10 sec goes up by .1-.2 so that it's easier to earn the money
5. Maybe allow us to keep some of the money earned in the last round, even if only 10-30% it would be a huge help.
Otherwise, I love it, it has great potential to be an amazing game!
It will trigger next time you level up, don't worry :)